Do you mean you hadn't finished it and it went POOF? I've had that happen. I am a touch typist, but sometimes the fingers get flying and I hit some wierd letter combination that kicks me out of the post editor.
Or do you mean that you can't find the post after you hit submit? If you click on your own user name (the one at the top left of your post above) you can view your public profile. One of the hot links on that page is "view all posts by..." clicking on that will bring up all your posts.